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Proper sound pressure level meters for testing gunshots are very expensive, and are not commonly available. The only sound level meters than can accurately and consistently measure gunshot peak sound...

It’s on Dean Maiseys suppressor page. I always thought the results looked a bit lop sided towards Hardy. As all suppressors in NZ are very similar in design.

Look at Dean Maiseys take on the suppressor test done In Rod and Rifle.
Also Maniatis suppressors are as good if not better than any opposition have
Hardy,DPT and ASE and they have same recoil,...